I'm not even sure... I think it's more of a power thing for me. You know when guy and a girl fuck it can be seen as a way to express power or dominance (I mean love is involved too...) when I see/read about two guys fucking I just love the feeling of thinking that the uke is weak or worthless or loosing power/manliness... fuck this sounds weird! It works for me because I always see girls as weak. (not to offend eny one. I'm a girl too) and I'm kind of a masochist so dominance is important to me... (I also mostly read rape yaoi bc there the power thing goes to another level)
I just love seeing the ukes cry and beg and all...
If you also like that, I suggest checking out this manga http://www.mangago.zone/read-manga/shirouto_yankee_kikiippatsu/
I wanna know. What turns you guys on when reading yaoi?
For me, its the uke's hot and completely aroused face when the seme's d*ck is deep inside him.
ITS JUST..... SO GOOD TO SEE THE UKE SO TURNED ON!!!! ლ(´ڡ`ლ)